bing tracking image
  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Powered Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 118727
Our Price: $65.67
Custom Fit Vehicle Wiring

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Shipping Weight: 1.73 lbs
Add to cart
In Stock
Tekonsha Trailer Hitch Wiring - 118727
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118727 or order online at etrailer.com. Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (289)
  • Q & A (0)
  • Photos

Tekonsha Custom Fit Vehicle Wiring - 118727

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • Tekonsha

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.


Features:

  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite power module that connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the tail lights on both the driver's side and passenger's side. You will need to remove the tail lights to access this harness.


T-One Connection Location Points Behind Tail Lights

Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.


Once installation is complete, the 4-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.


It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.


ModuLite Power Module

A ModuLite power module is built into this T-One connector. With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.



118727 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite Converter Included

Installation Details 118727 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:


Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118727

Average Customer Rating:  4.8 out of 5 stars   (289 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.

by:

Installation was tedious but not really bad. Running wiring requires crawling around under the vehicle [Jeep] but everything works ok. I did end up with a parasitic draw which pulled the battery down. I haven't had time to trouble shoot is I just pull the fuse when not using. I only pull a trailer every month or so.



by:

Fast shipping delivery. Great customer support, received multiple follow up emails and personalized video to the parts I ordered. Heavy duty, quality products. Would order again.



by:

Product was pretty easy to install although it did require running wires along the length of the vehicle from the back up to the battery. Can also be a little tricky to fit the box in the tail light. Overall very happy with the purchase



by:

I'm a mechanic at Kafferlin sales where I had the order sent to. Installing the wiring harness wasn't difficult at all. Good value, Thanks, Michael Gates

Michael G.

7/14/2023

We used the trailer weeks ago. Lights still work. Thats good. I plan on checking over the installation to check for corrosion from salt etc.



by:

The unit and electrics came quickly and in good shape. Since I had several hitch mounts under my belt, this one for the Jeep was easy to do, a couple bolts and done. Watch the video, and make sure you torque them to correct specs! I had a garage friend of mine do the electrics, since there was no plug on the Jeep when I got it. Everything works as it should!



by:
2021 Jeep Grand Cherokee

Very helpful finding right hirch and harness.arrived in good shape and promptly.



by:
Jeep Grand Cherokee

This set up is easy to install, and has worked perfectly the entire time. I even purchased an adapter for the original 4 pin, to use it for 7 blades, and no issues whatsoever. The fun part of course is getting the black power wire all the way to the front of the Jeep. Now I will caution that I have at 5.7L Jeep Grand Cherokee Limited and getting the black wire to the battery was a little tricky. I ended up using some fishing wire to get to the undercarriage through the hollow rectangular casing that protects the other sheathed wiring for the vehicle. I have attached a photo for simplification. The rest was as easy to install as the video showed.



by:
2018 Jeep Grand Cherokee

The T-One connector for my 2018 Jeep Grand Cherokee worked great once installed. The installation of the wiring plugs, behind the tail lights went smoothly. The power wire that had to be run from the rear left corner of the Jeep to the under hood area was more difficult. It took me over an hour to find suitable locations to secure the power wire along the under-carriage so it wouldn't get burned by hot lines and exhaust pipes. The photos in the installation instruction sheet were very blurry and dark making them useless. Fortunately the online instructions from the etrailer web site were very clear. The Draw-Tight hitch was very easy to install. I used my floor jack to raise the hitch under the Jeep, which was backed onto portable ramps. I took me about 30 minutes to install the hitch and it looks great. I have enclosed photos of the four-way plug installed on the new Draw-Tight trailer hitch. Don't forget to order the four-way plug mounting bracket (P/N: 18144) as it is not included with either the hitch or the wiring kit. I highly recommend these products.



by:
2020 Jeep Grand Cherokee

Went to the Jeep dealership and they wanted $800 just to activate the trailer lights! Went to etrailer.com and got the wiring harness for less than $100! Excellent instructions and took only half an hour to install the wiring harness. Will purchase future products from them and give them lots of referrals.



by:
2021 Jeep Cherokee

At first I was a little leery of taking things apart especially on a newer vehicle but after your heart calms down to read the instructions look at a few videos it was easier than cutting a piece of cake simplified very easy took me longer to crawl under the car to run wires and it actually did the hook up the terminals very inexpensive compared to factory wiring kits would buy from them again thank you



by:

After one year this product shows its here to stay, the durability and ease of use makes this the most simple part of touring with my artwork. I highly recommend this product!



by:

T-One wiring Harness #118727 and Draw Tite Trailer Hitch Receiver #75699 both were easy to install and look great.



by:
2019 Jeep Grand Cherokee

Installation took a little time, but the kit works perfectly and is as described. The online instructional video etrailer.com has on the website made install a breeze (even for an average DIY-er).



by:

Absolute top of the line customer servi ce.



by:

Great product, easy to install as far as the product goes. However, for my jeep it was a pain as i had to take the wheel well covers off, remove the 3m tape, and reapply just to run the wires that connect to the tailights properly.



by:

This kit was easy to install and exactly what I needed. I had a particular need and reached out to eteailer and received a quick response. Perfect!



by:

Very easy to follow instructions, installed over a year ago and have had no problems. Customer service has been excellent as well. I do recommend this company.



by:
2014 Jeep Grand Cherokee

Easy to install and perfect fit for my 2014 Grand Cherokee Laredo! Great customer service (I ordered wrong wiring kit and they straightened it out)



by:

everything fitted correctly and the quality seemed ok



by:

I did not receive the wiring harness or the bracket. The shipping box was torn open and those items were missing. I waited weeks for this delivery and was truly disappointed.

Etrailer Expert

Jenny N.

9/23/2022

I can understand being disappointed with how the order was received. Customer service will reach out to you.



by:
2014 Jeep Grand Cherokee

Best price on the net. Received much more than expected from etrailer ! George and his team made sure I knew when they received order, the day it shipped and the day I received the part. Excellent service. Thank you



by:

Easy to install. Cross bar of hitch is hidden.



by:
2017 Jeep Grand Cherokee

very detailed instructions and video for wiring. Easy installation and I would order from them again



by:

Etrailer came through again!! Always has what I want and they get it to me fast. I don’t even shop around. Thanks y’all



by:

Just received my products today. I have not installed them yet but up to this point the service has been great! Dena was super helpful when I could not figure out what I needed to install a trailer hitch and wiring for my 2019 Jeep Cherokee.

Bill

11/9/2020

Great. Ihave not had a moments trouble with it.


25
289
Show More Reviews

See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring

  • Wire Functions of 4-Way For Wiring Harness 118727
    On the 4-way of the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118727 are the green is right turn and brakes, the yellow is left turn and brakes, the brown is tail lights and the white is ground.
    view full answer...
  • 2018 Grand Cherokee Limited Trailer Wiring Recommendation
    Yes, for your 2018 Jeep Grand Cherokee Limited the T-One trailer wiring kit part # 118727 that you referenced is the correct kit you need. Since you do not have the factory tow package wiring this kit is what you need since it allows you to tap into the vehicle's wiring by installing inline with the vehicle taillight wiring. This kit also has our most reliable converter box too which is why we recommend it so highly.
    view full answer...
  • 4-Way Trailer Wiring for a 2021 Jeep Grand Cherokee without a Factory Tow Package
    To get a 4-pole wiring harness for your 2021 Jeep Grand Cherokee without a factory tow package, the T-One Harness that you referenced, part # 118727, is in fact the correct kit to install. This kit comes with everything you need for installation. It also does not require any splicing into your vehicles wiring as the connection points for the lights are made using the plugs in the light harnesses. I've linked to a video installation of this kit on a 2020 Grand Cherokee for you to reference.
    view full answer...
  • Do I Need To Have My 2022 Jeep Grand Cherokee WK Flashed By a Dealer To Work The Trailer Lights ?
    The T-One Vehicle Wiring Harness # 118727 for your 2022 Jeep Grand Cherokee WK Laredo will not require any programming from the dealer. Since this system ties into the tail lights circuits rather than the factory to port connection.
    view full answer...
  • Where Does Power Wire of Trailer Wiring for 2018 Jeep Grand Cherokee Need to Run
    The power wire of the Tekonsha trailer wiring kit part # 118727 needs to run to the battery of the vehicle so for your 2018 Jeep Grand Cherokee you'd need to run it to the battery under the seat. Check out the install video link I attached for more info.
    view full answer...
  • Recommended 4-Way Trailer Wiring Harness for 2019 Jeep Grand Cherokee
    Since your 2019 Jeep Grand Cherokee isn't equipped with the factory US Car connector under the bumper then your best option for adding the needed 4-Way harness is with the Tekonsha T-One # 118727. This is still a custom harness that installs by simply plugging into factory ports behind the driver and passenger side tail lights (you will need to remove the tail lights to access the harness). Then as you mentioned, the hot lead will need to be run up to the Jeep's battery. When this type...
    view full answer...
  • Trailer Wiring for 2020 Jeep Grand Cherokee without Tow Package
    Yes, for your 2020 Jeep Grand Cherokee that isn't equipped with the factory tow package, the Tekonsha T-One Vehicle Wiring Harness # 118727 will work perfectly. This custom harness is going to plug into existing ports behind the tail lights and receive power by running up a hot lead to the Jeep's battery. This will provide you with a reliable 4-Way connector to power the basic signal lights on your trailer. I have attached an installation video below that you can also check out.
    view full answer...
  • Recommended 4-Way Trailer Wiring Harness For 2016 Jeep Grand Cherokee
    For you 2016 Jeep Grand Cherokee, I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118727. This will plug into the factory wiring behind your tail lights with quick connects that simply snap into place and will give you the 4-way trailer connector without thinking about the dealership except to imagine the money you saved. This wiring harness has a powered ModuLite that prevents overloading your vehicle's electrical system. I've attached an article...
    view full answer...
  • Trailer Wiring Recommendation for 2016 Jeep Grand Cherokee without Tow Package
    For trailer wiring that is confirmed as a fit for your 2016 Jeep Grand Cherokee that does not require ECU flashing we have the T-One kit part # 118727 which will install by plugging inline with the factory taillight harnesses your vehicle has currently and does not require an ECU flash. I attached an install video for this harness for you to check out as well.
    view full answer...
  • Will Installing a T-one Vehicle Wiring Harness With Module Drain the Battery?
    You are perfectly fine to install this on your 2021 Jeep Grand Cherokee. The power wire runs to the module in the wiring harness. The module acts as a relay which your vehicle has lots of that don't run down the battery unless they are being used. When you activate your brake lights or signals the module senses their activation and sends power from your battery to control the lights on the trailer. This helps to prevent drawing to much power from the vehicles electrical wires that may cause...
    view full answer...
  • Trailer Wiring Harness Recommendation for 2020 Jeep Grand Cherokee
    The trailer wiring harness I recommend for your 2020 Jeep Grand Cherokee is the Tekonsha part # 118727 installs easily by plugging inline with the taillight connectors of your vehicle and also has a really reliable converter box as well. I attached an install video for this on a very similar 2019 Grand Cherokee.
    view full answer...
  • Running Lights Stay on When Car is Off With 118727
    There are numerous possible reasons the running lights stay on when your Jeep is off with the 4-Way # 118727. By far the most likely though is a bad ground so double check to make sure your grounds are attached to completely bare metal surfaces and free of any paint, dirt or corrosion. The other issue that may be happening is if your trailer has LED lights; if so, and the running lights are staying on dimly, that is something that simply occurs with LEDs from time to time and you can simply...
    view full answer...
  • Is There a Wiring Harness For a 2021 Jeep Grand Cherokee That Does Not Use a Powered Converter?
    There is not a harness like the T-One Vehicle Wiring Harness # 118727 that will plug into the factory tail lights on your 2021 Jeep Grand Cherokee and work without a power wire running to the battery. Your Jeep needs the powered converter as the factory wiring in your Jeep is not able to safely run additional trailer lights without risking damage to the factory wiring. For many older vehicles it was never an issue but as manufacturers today have reduced the wiring to only what is needed...
    view full answer...
  • Trailer Wiring Recommendation for 2020 Jeep Grand Cherokee
    The best 4-way trailer wiring harness we have that would fit your 2020 Jeep Grand Cherokee is the Tekonsha part # 118727 because of how easy it is to install and how reliable the converter box is. I attached an install video for it on a similar 2019 for you to check out as well.
    view full answer...
  • Recommended 4-Way Harness for 2018 Jeep Grand Cherokee
    For your 2018 Jeep Grand Cherokee that doesn't have the factory harness I recommend the Tekonsha T-One Vehicle Wiring Harness # 118727. This custom harness will install by simply plugging into built-in ports behind the driver and passenger side tail lights and then running the hot lead up to the battery. This will provide you with a 4-Way connector to connect with and power a trailer's basic signal lights. I really like the Tekonsha harnesses in particular because we get far fewer troubleshooting...
    view full answer...
  • Would Dealer Reprogramming Fix No Taillights on 2017 Jeep Grand Cherokee
    If the vehicle requires dealer reprogramming then it's likely that none of the trailer lighting signal would work. If you only have a few that are not working then this is just likely a blown fuse so that is what I recommend checking first. The owner's manual for the vehicle will be able to tell you what fuses are located where. If the fuses are good then you'd need to take a trip to the dealer. That said, you can bypass any factory trailer wiring issues using the T-One Vehicle Wiring Harness...
    view full answer...
  • Will The Tekonsha Wiring Harness Installed On 2019 Jeep Grand Cherokee Void The Warranty
    As long as Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118727 is installed properly the wiring will not void your warranty. You are protected under the Magnuson–Moss Warranty Act which states that manufactures cannot void the warranty of a vehicle simply because of an after-market part unless that part caused the issue. The Tekonsha T-One wiring harness is a custom fit harness for your vehicle so it does not require splicing into the vehicle's electrical...
    view full answer...
  • Trailer Wiring Kit Recommendation for 2021 Jeep Grand Cherokee
    The best 4-way trailer wiring kit we have for your 2021 Jeep Grand Cherokee is the Tekonsha part # 118727 which installs very easily and has the most reliable converter box. I attached an install video for you to check out as well.
    view full answer...
  • 4-Pole Trailer Wiring Harness Installation in 2015 Grand Cherokee Without Factory Tow Package
    The Tekonsha 4-Pole Vehicle Wiring Harness # 118727 is a confirmed fit on your 2015 Jeep Grand Cherokee without factory tow package. The written instructions are linked along with a helpful article that will aid your installation. Once you have installed the harness according to the instructions it will not be necessary to have your dealership flash the computer, according to my contact at Tekonsha.
    view full answer...
  • 4-Way Trailer Wiring Harness Recommendation for 2016 Jeep Grand Cherokee
    Most likely your 2016 Jeep Grand Cherokee comes with a trailer wiring harness installed, but in case it does not we have the Tekonsha kit part # 118727 which is a confirmed fit. This harness is listed as a fit for your vehicle for if it did not have factory wiring so there wouldn't be a need for this harness if all Grand Cherokees of this generation came from the factory with wiring.
    view full answer...
  • Trailer Wiring Recommendation for 2020 Jeep Grand Cherokee
    The best trailer wiring kit we offer for your 2020 Jeep Grand Cherokee is the Tekonsha kit part # 118727 which is very easy to install as it plugs inline with the taillight wiring of your vehicle (no splicing), and comes with the most reliable converter box we offer as well. Check out the install video I attached for more info as well.
    view full answer...
  • How to Add a Trailer Connector to a 2019 Jeep Grand Cherokee
    You can easily add a 4-flat trailer connector to your 2019 Jeep Grand Cherokee without the factory tow package, you simply need to add the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118727. To install this connector you will need to plug the harness into connection points behind your Jeep's tail lights and then run a hot lead to your battery. I have added a link to a video install of this connector on a '19 Grand Cherokee for you to take a look at, as well a link...
    view full answer...
  • Does Trailer Wiring for 2019 Jeep Grand Cherokee Require Running Wire to Battery
    In order to protect the wiring of your leased 2019 Jeep Grand Cherokee I have to recommend you run the power wire of the kit to your vehicle battery. Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need a setup that draws power from the battery. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight circuits....
    view full answer...
  • What Would Cause Trailer Wiring to Prevent Vehicle Taillights from Functioning
    Typically when this happens it's that one of the pins of the connectors unseated and stopped allowing the circuits to pass back through to the vehicle wiring and allow the taillights to function. Since the converter box does not integrate at all into this it's not usually the trailer wiring harness. I'd try plugging the harness back in to see if that takes care of the issue.
    view full answer...


< Previous
123. . .10



Do you have a question about this Custom Fit Vehicle Wiring?


Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Lindsey S
Edited by:
Lindsey S
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Dustin K
Video by:
Dustin K
Employee Zach D
Video by:
Zach D
Employee Jonathan Y
Video by:
Jonathan Y
Employee Michael B
Video by:
Michael B
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Alexander C
Written by:
Alexander C
Employee Shane H
Test Fit:
Shane H
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F
Employee Bradley B
Test Fit:
Bradley B

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.


Product Experts Available Now!
Call 1-800-940-8924